Title :
Appropriate windowing for group delay analysis and roots of z-transform of speech signals
Author :
Bozkurt, Baris ; Doval, Boris ; D´Alessandro, Christophe ; Dutoit, Thierry
Author_Institution :
TCTS Lab., Fac. Polytech. de Mons, Mons, Belgium
Abstract :
This study discusses the difficulties of phase spectrum analysis of speech signals and shows that appropriate windowing is very crucial for obtaining reliable phase spectra. The main difficulties of phase based analysis stem from the domination of spiky effects of roots (zeros) of the signal z-transform close to the unit circle. We show how this problem is linked to windowing by discussing zero-patterns for speech signals. Once windowing is performed properly, group delay functions are much less noisy and reveal clearly formant information.
Keywords :
Z transforms; spectral analysis; speech processing; group delay analysis; phase based analysis; phase spectrum analysis; reliable phase spectra; signal Z-transform; speech signal analysis; spiky effects; unit circle; windowing approach; zero-patterns; Abstracts; Transforms;
Conference_Titel :
Signal Processing Conference, 2004 12th European
Conference_Location :
Vienna
Print_ISBN :
978-320-0001-65-7